Circulation, Vol 86, 1310-1316, Copyright © 1992 by American Heart Association
GJ Grover, PG Sleph and S Dzwonczyk
BACKGROUND. A brief period of myocardial ischemia can result in an
increased resistance to subsequent, more severe episodes of ischemia.
Recent studies have indicated that activation of adenosine A1-receptors may
mediate this preconditioning effect. It is also known that A1- activation
can lead to ATP-sensitive potassium channel (KATP) opening via a G(i)
protein-mediated effect. Thus, we determined whether the KATP blocker
glyburide could abolish preconditioning or the protective effects of
A1-receptor activation. METHODS AND RESULTS. Anesthetized dogs were
subjected to 5 minutes of left circumflex coronary artery (LCx) occlusion
(or sham) followed by 10 minutes of reperfusion. The hearts were then
subjected to 60 minutes of LCx occlusion and 5 hours of reperfusion.
Glyburide (5 micrograms/kg/min) or vehicle was given directly into the LCx
20 minutes before preconditioning or sham preconditioning. Preconditioning
resulted in a significantly reduced infarct size compared with
nonpreconditioned animals. Glyburide abolished the protective effect of
preconditioning. To establish a link between KATP and A1-receptor
activation, the effect of the A1-agonist R- PIA with or without glyburide
on infarct size was determined. R-PIA (0.4 microgram/kg/min, directly into
the LCx) significantly reduced infarct size, and this protective effect was
abolished by glyburide. None of the treatments described above had a
significant effect on peripheral hemodynamic status or myocardial blood
flow. CONCLUSIONS. Preconditioning may be mediated by KATP activation, and
this may be linked to A1-receptor stimulation.
ARTICLES
Role of myocardial ATP-sensitive potassium channels in mediating preconditioning in the dog heart and their possible interaction with adenosine A1-receptors
Department of Pharmacology, Bristol-Myers Squibb Pharmaceutical Research Institute, Princeton, NJ 08543-4000.
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